21335000 has 80 divisors (see below), whose sum is σ = 53139240. Its totient is φ = 8000000.

The previous prime is 21334997. The next prime is 21335023. The reversal of 21335000 is 53312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 84875 + ... + 85125.

Almost surely, 2^21335000 is an apocalyptic number.

21335000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21335000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26569620).

21335000 is an abundant number, since it is smaller than the sum of its proper divisors (31804240).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21335000 is a wasteful number, since it uses less digits than its factorization.

21335000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294 (or 275 counting only the distinct ones).

The product of its (nonzero) digits is 90, while the sum is 14.

The square root of 21335000 is about 4618.9825719524. The cubic root of 21335000 is about 277.3517320655.

Adding to 21335000 its reverse (53312), we get a palindrome (21388312).

The spelling of 21335000 in words is "twenty-one million, three hundred thirty-five thousand".